从二十世纪六十年代起，护河者这样的组织，以及民谣歌手皮特•西格这样的倡导者，一直竭力恢复哈德逊河的生态系统。
Since the 1960s, groups like Riverkeeper and advocates such as Pete Seeger, a folk singer, have fought to restore the river’s ecosystem.
从二十世纪六十年代起，护河者这样的组织，以及民谣歌手皮特·西格这样的倡导者，一直竭力恢复哈德逊河的生态系统。
Since the 1960s, groups like Riverkeeper and advocates such as Pete Seeger, a folk singer, have fought to restore the river's ecosystem.
早期的远程学习借助于邮政系统，现在使用的是计算机、卫星和互联网。 远程学习并不是一个崭新的概念，最早的远程学习可能是皮特曼组织于十九世纪末开设的速记课程。
The first structured distance learning or correspondence courses were probably the shorthand courses offered by the Pitman organization at the end of the 19th century.
该系统采用基于自组织神经网络分类器，其在线分类结果与人工配皮的一致性在84%以上。
The system adopts the neuro-network sorter based on self-organization. The consistence of the on-line sorting result with artificial sorting is above 84%.
对沂蒙黑山羊和济宁青山羊板皮的皮肤组织结构进行了系统的研究。
The skin structure of Yimeng black and Jining grey goats was systematically studied in this paper.
对沂蒙黑山羊和济宁青山羊板皮的皮肤组织结构进行了系统的研究。
The skin structure of Yimeng black and Jining grey goats was systematically studied in this paper.
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